Arbitration analysis: The Swedish Supreme Court has upheld part of an arbitral award in an investor-state arbitration which contained intra-EU elements. This new ruling sheds further light on the practical possibility to use investor-state arbitration in the EU, in the post-Achmea era. The Supreme Court overturned the full annulment of the arbitral award ordered by the Svea Court of Appeal, declaring only a partial annulment. In doing so, the Supreme Court held that, despite being part of the very same investment and the same arbitral proceedings, the claims made by the non-EU investor (a Swiss investor) were sufficiently distinguishable from those of the four EU investors. Thus, the court found that ordre public did not require that the entire arbitral award be annulled, and therefore the court allowed the award to stand against the Swiss investor. It follows that, for arbitrations seated in Sweden, non-EU investors may under certain circumstances still rely on investor-state dispute settlement (ISDS) arbitration against EU member states, even in situations when the disputed investment also involved co-investors from the EU. Written by James Hope, partner, Nils Ivars, senior associate, Martin Hammarskiöld, associate at Vinge, Stockholm, Sweden.